公开(公告)号：US20240286211A1

公开(公告)日：2024-08-29

申请号：US18569858

申请日：2022-06-15

Applicant: A.L.M.T. Corp.

Inventor： Yuma MIYAZAKI

IPC: B23D77/02

CPC classification number: B23D77/02 ,  B23D2277/04

Abstract: A rotary cutting tool includes a first cutting blade, a second cutting blade, a third cutting blade, a fourth cutting blade, and a fifth cutting blade on a circumference, in which a rotation angle from the first cutting blade to the second cutting blade is 60±1°, a rotation angle from the second cutting blade to the third cutting blade is 75±1°, a rotation angle from the third cutting blade to the fourth cutting blade is 60±1°, a rotation angle from the fourth cutting blade to the fifth cutting blade is 75±1°, and a rotation angle from the fifth cutting blade to the first cutting blade is 90±1°.

公开(公告)号：US20200230708A1

公开(公告)日：2020-07-23

申请号：US16647536

申请日：2018-09-18

Applicant: A.L.M.T. Corp.

Inventor： Yuma MIYAZAKI ,  Kentaro SHIRO

IPC: B23B27/16

Abstract: An outer peripheral cutting edge located on a rear side in a rotation axis direction of the inclined cutting edge, a rotation diameter of the base metal on the rear side in the rotation axis direction of the outer peripheral cutting edge is smaller than a rotation diameter of the outer peripheral cutting edge, in a cross section perpendicular to a direction in which the inclined cutting edge extends, a cutting edge ridge of the inclined cutting edge has a roundness of a radius less than or equal to 30 μm, and a maximum height difference value of the cutting edge ridge of the inclined cutting edge is less than or equal to 20 μm.